CN101312293B - Power lithium battery intelligent management system - Google Patents
Power lithium battery intelligent management system Download PDFInfo
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- CN101312293B CN101312293B CN2007100745090A CN200710074509A CN101312293B CN 101312293 B CN101312293 B CN 101312293B CN 2007100745090 A CN2007100745090 A CN 2007100745090A CN 200710074509 A CN200710074509 A CN 200710074509A CN 101312293 B CN101312293 B CN 101312293B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
Disclosed is a device carrying out whole-course, real-time and comprehensive monitoring, such as parameter detection, analysis, learning, control, display, external communication and the like, for the charging-discharging process of a lithium battery pack, namely an intelligent management system for power lithium batteries, which mainly comprises a voltage detection device, a current detection device for detecting electric current in the process of charging and discharging of the lithium battery pack, a temperature detection device, a control device, a charging-discharging state judgment device, a computing device, a data storage device, a parameter correction device, an automatic learning device, a data display device, a communication device, a protection device, a system automatic diagnosis device and an alarm display device. Further disclosed is a device (instrument) for detecting the performance of the lithium battery, which mainly comprises a voltage detection device, a current detection device, a temperature detection device, a control device, a computing device, a data storage device, a parameter correction device, a residual capacity judgment device, a data display device, a communication device, a protection device, a system automatic diagnosis device and an alarm display device.
Description
Technical field
The present invention relates to all uses lithium battery to be the industry of the energy and the industry that need carry out Performance Detection to lithium battery.Specifically, the present invention relates to use the electric bicycle of lithium battery, battery-operated motor cycle, electric automobile, and communication equipment, IT industry (as: notebook computer) and military equipment fields such as (as: communication, radar, navigator and naval vessels); The manufacturing industry that also relates to simultaneously lithium battery.
Background technology
Along with the fast development of lithium battery in recent years, because that it has a volume is little, in light weight, the high-energy ratio, pollution-free, advantage such as self-discharge rate is low is a kind of novel energy product of performance the best in the present storage battery like product.But because lithium battery is the same with other storage battery, exists and overcharge, cross the problem that has a strong impact on its use such as put; To such an extent as to up to the present, lithium battery also can not get using widely, especially jumbo dynamic lithium battery.And some li-ion cell protection plates in the market or so-called manager also can only be from the most basic real-time voltages of lithium battery, and electric current is judged its surface property and operating state; And do not provide user's required some necessary parameters (as the dynamic open circuit voltage of lithium battery, internal resistance, residual capacity etc.) in the use of lithium battery; The parameter that is provided in other words exists and big error: calculate according to voltage method such as the present residual capacity that product provided is a kind of, this is at new battery, and under the situation of constant-current discharge, also has certain use value, but lithium battery can be constantly aging in the process that reality is used, and situation commonly used then can not be constant-current discharge, and therefore the error that causes is also just very big; Also having a kind of is integration method, and this method not only needs very big calculating memory space, and equally also exists because of the increase that discharges and recharges number of times and cause the error that aging of lithium battery brings.To such an extent as to can not well satisfy the application need of lithium battery, particularly large-capacity power lithium battery; Therefore equally also exist severe safety problem.The relevant blast that causes because of the safety problem that lithium battery in use occurs, reports such as burning occur now and then in the past few years.The environmental protection electric power storage product that premium properties like this is arranged, and use because the problem safe in utilization of its sternness can not get excellent popularization.
Summary of the invention
Comprise: purpose, technical scheme, beneficial effect three parts.
1, purpose
The present invention is in order further to promote the safe handling of dynamic lithium battery; Outside the weak point that in having solved the said goods technology, has existed, provide a kind of power lithium battery intelligent management system of safety and reliability more comprehensively.It has not only solved the deficiency that exists in the said goods technology, and more functions of more using use value are provided, such as communication function, Presentation Function etc.
2, technical scheme
A kind of power lithium battery intelligent management system of the present invention, its feature mainly comprises the following aspects:
(1), at first by basic voltage and temperature sampling value, obtain charging control and the balanced controlling mechanism of lithium battery group in first work period, it is charged.And obtain the internal resistance value of every joint cell in this work period in the lithium battery group in the process that recharges here.
(2), the real-time sampling value by voltage, electric current and temperature in discharge process, and the internal resistance value of each cell that obtains in the charging process in this work period is controlled discharge with relevant calculated value and is exported and equalization discharge.
(3), second work period so that all working of back can be by voltage, electric current and temperature real-time in the course of work and the internal resistance value of bringing in constant renewal in and revising in charging process in the cycle, control with relevant calculated value and discharge and recharge and equilibrium.
(4), the real-time sampling value by voltage, electric current and temperature in discharge process, and the internal resistance value of each cell that obtains in the charging process in this work period calculates the real-time at work open-circuit voltage values of each cell in the lithium battery group.
(5), (begin cycle charge-discharge from new lithium battery, its end-of-life condition that provides up to the manufacturer according to lithium battery satisfies for finishing haveing suffered use by the lithium battery that obtains again.) in, the one group of relation curve and the relevant relation function of open circuit voltage, working temperature and residual capacity.
(6), according to the internal resistance value and real-time at work open-circuit voltage values and the real-time working electric current of lithium battery and the selected relation function of lithium battery of lithium battery, calculate the residual capacity of lithium battery.
A kind of power lithium battery intelligent management system of the present invention is made up of following components: (as accompanying drawing 1-power lithium battery intelligent management system block diagram)
A. the voltage sample of each cell and assembled battery total voltage sample circuit (as accompanying drawing 2-voltage sampling circuit schematic diagram) in the lithium battery group; Be used for checkout gear to each terminal voltage of battery pack.
B. charge and discharging current sample circuit (as accompanying drawing 3-charging and discharging current sample circuit schematic diagram); Be used for detecting the current device of battery pack at charge and discharge process.
C. battery serviceability temperature sample circuit (as accompanying drawing 4-battery serviceability temperature sample circuit schematic diagram); Be used to detect the battery pack device of each cell temperature in use.
D. display circuit (as scheming attached 5-display circuit schematic diagram); It comprises: can show the total voltage of current lithium battery group and each monomer battery voltage and minimax voltage, the open circuit voltage of each cell and minimax open circuit voltage in the lithium battery group under the operating state, and corresponding battery sequence number; Charging and discharging currents, the capacity that lefts in of battery pack, messages such as the operating state that temperature and battery pack are now located and the internal resistance of battery and fault;
E.RS-485 communicating circuit (as scheming attached 6-RS-485 communication system circuit schematic diagram); A kind of device that can carry out information exchange with computer and miscellaneous equipment and have isolation features.
F. charger, equalizer control and protective circuit (as accompanying drawing 7-charger, equalizer control and protective circuit schematic diagram); A kind of device of that be used to command control charger and equalizer and the positive-negative power line reversal connection that prevents to charge.
G. discharge output detects, control and current foldback circuit (detecting control and current foldback circuit schematic diagram as accompanying drawing 8-discharge output); A kind ofly be used to control battery power discharge output, and the electronic installation of overcurrent protection.
H. system moves the automatic diagnosis circuit; A kind ofly can detect the native system running status and the safety guard of the equipment running status that is connected with native system.
I. the mixed signal computer micro controller system (as accompanying drawing 9-computer micro controller system circuit theory diagrams) that has high-precision A-D (analog digital) conversion and high-speed computation and information stores; A kind of can the simulation and digital translation, arithmetic logical operation, the device of storage and input and control.
J. system power supply circuit (as accompanying drawing 10-system power supply circuit); A kind of DC transfer circuit that 12V, 5.0V, 3.3V can be provided for whole system, and automatic shutdown circuitry (as: its power supply just can shut down automatically according to the signal that the computer microcontroller sends when system works finishes).
Description of drawings:
Fig. 1 is the power lithium battery intelligent management system block diagram;
Fig. 2 is the voltage sampling circuit schematic diagram;
Fig. 3 is charging and discharging current sample circuit schematic diagram;
Fig. 4 is a battery serviceability temperature sample circuit schematic diagram;
Fig. 5 is the display circuit schematic diagram, comprises:
1. Fig. 5-1LED display circuit schematic diagram; 2. Fig. 5-2LCD display system circuit theory diagrams;
Fig. 6 is a RS-485 communication system circuit schematic diagram;
Fig. 7 is a charger, equalizer control and protective circuit schematic diagram;
Fig. 8 is that discharge output detects control and current foldback circuit schematic diagram;
Fig. 9 is computer micro controller system circuit theory diagrams.
Figure 10 is the system power supply circuit.
3, beneficial effect
The present invention compares with existing technology, product, has following advantage and beneficial effect:
(1), the present invention can provide in the course of the work a large amount of accurately technology parameters of relevant lithium battery performance of lithium battery, so that different users needs.
(2), the invention provides communication and display system, more be conducive to long-range integrated extensive multi units tube reason.
(3), the present invention can calculate more accurately the internal resistance of its lithium battery, and constantly revise in each charge and discharge process in the charging process of lithium battery; Come the degree of aging of characterizing battery with this.
(4), the present invention need not wait until that battery removes to gather its open-circuit voltage again after static a period of time in the situation of 0 load, but according to lithium battery real-time voltage in the course of the work, electric current and temperature are calculated the open-circuit voltage under its current intelligence; Therefore has very high actual use value.
(5), because in the course of the work real-time open-circuit voltage values and internal resistance value of lithium battery arranged, so the present invention can calculate the residual capacity of its lithium battery more accurately.
(6), simultaneously because in the course of the work real-time open-circuit voltage values and internal resistance value of lithium battery arranged, and other parameters that can measure in real time are such as the lithium battery operating temperature etc.; Comprehensive these parameters relevant with the lithium battery serviceability, so the present invention just can judge the performance of lithium battery more accurately, and discharge and recharge at it and to make corresponding processing in course of work; Farthest ensured the safe handling to lithium battery.
(7), the present invention in the circuit such as signal sampling, output input control and communication, adopt isolation technology more, therefore have very strong antijamming capability.
A kind of power lithium battery intelligent management system
Execution mode
Below in conjunction with concrete embodiment and accompanying drawing, the present invention is described in further detail.
Shown in accompanying drawing 1 (power lithium battery intelligent management system block diagram); a kind of power lithium battery intelligent management system of the present invention be by: voltage sampling circuit, charging and discharging currents sample circuit and temperature sampling circuit, display circuit, RS-485 communicating circuit, charger and equalizer control and protective circuit, discharge output detection and control and current foldback circuit, system's operation automatic diagnosis circuit, computer micro controller system, system power supply circuit, several parts are formed.
Shown in accompanying drawing 7 (charger and equalizer control and protective circuit schematic diagram) and accompanying drawing 10 (system power supply circuit theory diagrams), the present invention by being connected the start button (this button will be arranged on the charger) on charger interface " CC " 2 and 4 pin, just can start and enter charge mode work through diode D4 when charging; Whether and in charging process, the present invention constantly detects the signal condition from " C-M " end, be connected well with the present invention to detect charger.In charger part 2 of charger interface " CC " is connected with 3 pin, therefore as long as charger guarantees good being connected with the present invention, the signal that " C-M " holds just remains set condition.
Under charged state, the present invention begins start-up temperature detection system (as accompanying drawing 4-battery temperature and environment for use temperature sampling circuit schematic diagram), in whole charging process, the temperature T b of battery detects in real time, if detect the temperature T b of battery in the charging process〉45 ℃ then provide faulty indication and stop charging; Begin to detect the open circuit voltage V of each cell in the battery pack simultaneously by voltage sampling circuit (as accompanying drawing 2-voltage sampling circuit schematic diagram)
0, and judge wherein minimum open circuit voltage V
0minWhether less than 0.5V, the average open-circuit voltage V of battery pack
0Whether a is less than 4.0V; If V
0minLess than 0.5V, think that so this batteries in this battery pack has problem, just provide corresponding indication by display system, battery pack is not charged simultaneously; The present invention shuts down automatically after 5 minutes.If V
0minGreater than 0.5V, while V
0A is greater than 4.0V, and the present invention will start equalizing system (specific implementation method will be described further) in the equilibrium of back is set forth so; If V
0minGreater than 0.5V, while V
0A is less than 4.0V, and the present invention will send a charging instruction by charging control circuit (as accompanying drawing 7-charger and equalizer control and protective circuit schematic diagram), with the mode of maximum current battery activated; Begin to detect its charging current simultaneously, whether within setting range,, provide and report to the police and stop charging if exceed setting range then think that charger or relevant connection equipment have fault.If charging current is normal, just this activation will continue to stop after several seconds.Detect former V again
0minIf whether this batteries voltage less than the present invention will send another charging instruction, with minimum current 0.05C (lithium battery group as 10AH/36V be 0.5A) carries out precharge less than 1.5V; If former V
0minThis batteries voltage then sends another charging instruction greater than 1.5V, charges with 0.1C.Just begin another kind of charge mode up to this batteries voltage greater than 2.5V, its charging current is 0.4C (maximum charging current that this charging current must not provide greater than the battery production merchant).Meeting of the present invention constantly detects the on-Line Voltage U of its charging current and Ge Jie cell in its process
L, up to the online maximum voltage U of cell wherein
LmaxGreater than 4.05V, and satisfy U
Lmax-U
LA〉30mV (U
LThe online battery pack average voltage of a) the present invention will start the separate system (specifically shunting process will elaborate in the back) in the equalizing system.Continue charging, up to U
LA is greater than 4.20V, and satisfies U
LA-U
Lmin＜30mV (U
LminThe battery minimum voltage) and U
LmaxLess than 4.21V, the present invention will send another charging instruction, charge with 0.1C; If U in this testing process
LmaxGreater than 4.21V, the present invention will change its charging instruction, charge with 0.05C.Stop charging after 5 minutes, waited for 1 second and survey its voltage U, and judge Ua-U
Min30mV? (Ua and U
MinBy charging after stopping for 1 second the mean value of survey battery voltage and the voltage of a wherein minimum joint cell) if Ua-U
Min30mV the present invention will start the cell charge balancing system (concrete cell charge balancing process will elaborate in the back) in the equalizing system; If Ua-U
Min＜30mV then judges Ua again〉4.22V? if Ua＜4.22, and satisfy Ua＜4.20, judge U so again
Max4.21V? if will send instruction greater than the present invention, charge with 0.05C; If less than charging with 0.1C.Up to satisfying Ua〉4.20V, the present invention sends instruction again and starts 0.1C charging 5 minutes, is changed to 0.4C afterwards and charges for 1 second, just begins to detect each magnitude of voltage U
LFinish etc. voltage detecting, stop charging.Deng surveying its voltage U i 1 second.And calculate the relative internal resistance Ri=(U of battery
L-Ui)/Ic (Ic is a charging current).Preserve data at last; Charging finishes, and the present invention sends instruction A-TO=1 (as accompanying drawing 10-system power supply circuit theory diagrams), and system shuts down automatically.
In whole charging process, the present invention can be sent to display system as required with the data that system detected, and communication system.
Shown in accompanying drawing 8 (discharge output detection and control and current foldback circuit schematic diagram) and accompanying drawing 10 (system power supply circuit theory diagrams), the present invention by being connected the start button (this button will be arranged on the power consumption equipment) on discharge startup and pattern judgement interface " DC-C1 " 1 and 2 pin, just can start and enter discharge mode work through diode D5 when discharge; And in discharge process, the present invention constantly detects the signal condition from " DC-M " end and " D-D " end, judging whether power consumption equipment needs to carry out the electricity consumption operation or whether power consumption equipment is connected well with the present invention, and whether output-controlling device is normal among the present invention.To discharge in power consumption equipment part and to start and 1 being connected of pattern judgement interface " DC-C1 " with 3 pin, therefore as long as power consumption equipment carries out the electricity consumption operation or power consumption equipment guarantees good being connected with the present invention at needs, the signal that " DC-M " holds just remains set condition.
Under discharge condition, the present invention begins start-up temperature detection system (as accompanying drawing 4-battery temperature and environment for use temperature sampling circuit schematic diagram) equally, and the battery temperature Tb in the whole discharge process is detected in real time; Begin to detect the open circuit voltage U of each cell in the battery pack simultaneously by voltage sampling circuit (as accompanying drawing 2-voltage sampling circuit schematic diagram)
0, and with charging process in the relative internal resistance of cell value Ri that records carry out carrying capacity computing (concrete carrying capacity calculating process will be done further introduction below).Simultaneously the charge value that calculates is sent demonstration.
In the signal condition of temperature and each port just often, begin to discharge by control (exporting detection and control and current foldback circuit schematic diagram) as Fig. 8-discharge to " DC-C " port.And in discharge process, constantly detect its discharging current I
DC, judge I
DC2C? (maximum discharge current that this discharging current must not provide greater than the battery production merchant) cuts off battery pack by " DC-C " port power consumption equipment powered if greater than set point then control at once.If I
DCWithin setting range, judge Rimax〉0.05? (Rimax is maximum relative internal resistance.The set point of this judgement is different according to different lithium batteries.If) Rimax is arranged in the lithium battery group 0.05, judge the work temperature b of this batteries so again〉42 ℃? if Tb〉42 ℃, then need to calculate its maximum discharge current Irt under the situation of existing Rimax and Tb value (concrete computational methods will elaborate below), at this moment judge I
DCIrt? if I
DCIrt then needs to control at once, cut off battery pack by " DC-C " port power consumption equipment is powered.If I
DC＜Irt then can proceed discharge.Continue to detect discharging current I simultaneously
DC, and with its preservation.Whenever record I 10 times
DCCalculate one time mean value I
DCA, and with its preservation I
DCA1-I
DCA30 (totally 30 I
DCThe a register) I
DCAmong the a1, obtain a current I
DCThe I of a and the 30th time
DCThe poor Ia of a30 value; With I
DCA1-I
DCThe value of a30 is shifted successively, just I
DCThe value of a30 is removed (deletion), with I
DCThe value of a29 moves on to I
DCAmong the a30, I
DCThe value of a28 moves on to I
DCAmong the a29, so analogize up to I
DCA1 vacates, then with current I
DCA is saved in I
DCAmong the a1.Detect the online in real time total voltage U of battery pack in this process
sWith each monomer battery voltage U
LAnd the discharging current I of this moment
DCAnd calculate the open circuit total voltage U of battery pack when this state
0S, the open circuit voltage U of each cell
0And the dump energy Qmin of the cell of minimum electric weight in the battery pack, send demonstration with these data.Judge U
0min3.0V? if U
0min3.0V, discharge just continued; If U
0min＜3.0V judges U so again
0min2.8V? if U
0min2.8V, just provide corresponding indication, soon be through with the expression discharge, continue discharge; Up to U
0min≤ 2.8V just cuts off battery pack by " DC-C " port power consumption equipment is powered, and discharge stops, and provides indication.Judge whether to carry out equilibrium, if condition satisfies, system will enter equalization discharge pattern (specific implementation method of equalization discharge will be further elaborated in the back); If condition does not satisfy, system will send instruction (as accompanying drawing 10-system power supply circuit theory diagrams) to " A-TO " port, automatically shutdown.Discharge finishes.In addition; in discharge process; the present invention detects the state (as accompanying drawing 8-discharge output detection and control and current foldback circuit schematic diagram) of " DC-M " and " D-D "; and the relevant parameter of battery pack satisfies the condition of equalization discharge, and the present invention equally also starts equalization discharge (specific implementation method of equalization discharge will be further elaborated in the back) so.Mentioned equilibrium during superincumbent charge and discharge process is described and be divided into charge balancing and equalization discharge two large divisions, its charge balancing is divided into 2 processes again, and the firstth, charging shunting process; The secondth, cell charging process in the battery pack.Equalization discharge then only comprises cell charging process in the battery pack.Work as system in the electric process and detect U
Lmax4.05V, and U
Lmax-U
LA〉during 30mV, system will start shunting, to U
LmaxThe joint cell is shunted.Detect the cell voltage U that is shunted simultaneously
DT judges U
Lmax-U
DT〉15mV? if relation is false, think that then shunting has fault; Provide indication and stop shunting.If U
Lmax-U
DT〉15mV concerns establishment, judging U
Lmax＜4.15V? if then start the 0.4C charging.Deng 1 minute 1.; If not, then judge U again
Lmax＜4.23V? if then start the 0.1C charging.Deng 1 minute 2.; If neither, wait 1 minute 3., stop charging and shunting, survey each voltage of battery pack this moment, and judge the current voltage U of once being shunted of that joint cell
DWhether the difference of the average voltage Ua0 of t0 and current battery pack poor less than this two parameter before this shunting, i.e. U
DT0-Ua0＜U
Lmax-U
LA? if this relation is false, then shunting has problem, provides indication and stop shunting continuing charging.If this concerns establishment, then judge Ua0-U
DT0〉25mV? be not more than and just continue shunting.Greater than, then system finds out an existing maximum monomer battery voltage U who takes turns in the battery pack
LmaxAverage voltage U with battery pack
LWhether the difference of a promptly judges U greater than 30mV
Lmax-U
LA〉30mV? if relation is false, then withdraw from shunting, continue charging.If relation is set up, then continue the shunting of next round.(top " waiting 1 minute " of 1. 2. 3. locating is the same point of several relations.)
In charging process, if U
LA is greater than 4.20V, and satisfies U
LA-U
Lmin＜30mV (U
LminThe battery minimum voltage) and U
LmaxLess than 4.21V, the present invention will send another charging instruction, charge with 0.1C; If U in this testing process
LmaxGreater than 4.21V, the present invention will change its charging instruction, charge with 0.05C.Stop charging after 5 minutes, waited for 1 second and survey its voltage U, and judge Ua-U
Min30mV? (Ua and U
MinBy charging after stopping for 1 second the mean value of survey battery voltage and the voltage of a wherein minimum joint cell) if Ua-U
Min30mV the present invention will start the cell charge balancing system in the equalizing system; Battery to the voltage minimum carries out charge balancing, and detect once by this batteries voltage U of equilibrium simultaneously per 10 seconds
Emin, and with the voltage U in 10 seconds
Emin0Relatively, promptly judge U
Emin-U
Emin05mV? if relation is false, then think to provide balanced fault indication and withdraw from equilibrium; If relation is set up, then judge U
Lmax＜4.22V? if then send instruction, charge with 0.1C to charger; If not then charging with 0.05C.Deng 5 minutes, stop charging and balanced, survey each voltage of battery pack, judge this batteries voltage U of balanced back
EWith balanced preceding this batteries voltage U
EminWhether greater than 5mV, if not, then think and balanced fault withdraw from equilibrium; If then judge U
E-U
Ea25mV? (U
EaThe average voltage of battery pack during for equilibrium), then continue balanced if relation is false; If relation is set up, whether the difference of finding out the battery of minimum voltage in battery pack this moment and its mean value again greater than 30mV, if greater than, then continue this batteries is carried out equilibrium; If be not more than, then stop equilibrium and withdraw from.
In discharge process, if detect " DC-M "=0 and " D-D "=0 (as accompanying drawing 8-discharge output detection and control and current foldback circuit schematic diagram), Uca〉3.3V, and Uca-Ucmin〉(the average voltage of Uca each cell of battery pack during during 100mV for discharge, Ucmin is minimum cell voltage in when discharge battery pack), begin to start equalization discharge; This batteries of Ucmin is carried out equilibrium, judge 10 minutes simultaneously and whether arrive, if the time does not arrive, then judge " DC-M "=0? with temperature T b＜55 of each batteries ℃? if not, equalization discharge withdraws from; Otherwise continue balanced; If Tb＜55 ℃ are continued balanced; If Tb〉55 ℃, stop equilibrium, and provide faulty indication, equalization discharge withdraws from; If the time one arrives, then stop equilibrium.Survey the voltage of each battery; Whether this saves the balanced cell voltage difference of quilt greater than 10mV before and after relatively more balanced, if not, then provide the equalization discharge faulty indication, and withdraw from; If whether the difference of the average voltage Uca that then judges battery pack this moment and that just balanced batteries voltage greater than 100mV, if greater than, then continue this batteries is carried out equilibrium; Simultaneously, the time for balance of same batteries must not surpass 90 minutes, carries out equilibrium otherwise will find out the new battery that satisfies condition; Carry out equilibrium if not then finding out the new battery that satisfies condition.
Discharge process is mentioned in describing in the above, if in the lithium battery group Rimax is arranged〉0.05, and its work temperature b 42 ℃, then need to set up relation with its maximum discharge current Irt, to guarantee the discharge safety of battery pack according to the value of Rimax and Tb.The inventor has carried out repeatedly relevant test to the lithium battery of the LMP40 type of the lithium battery of the 370-10J type of certain company and another company respectively, the curve chart of describing according to test data, and drawn following functional expression:
This process is in the present invention shown in accompanying drawing 11 (workflow diagram).
Discharge process is also mentioned the carrying capacity computing in describing simultaneously in the above.Here carrying capacity is meant least residue electric weight Qmin in the battery pack.Real-time open circuit voltage U when in this calculating process, also relating to lithium battery work
0Calculating.The inventor has described three groups of matched curve figure according to great number tested data: first group is the lithium battery and the curve chart 1 (accompanying drawing 12) that fills full carrying capacity Qc of different internal resistance value Ri; Second group is discharge capacity Qdc and real-time open circuit voltage U
0The curve chart 2 of (calculated value) (accompanying drawing 13); The 3rd group is the real-time open circuit voltage U of lithium battery of different internal resistance values
0The curve chart 3 (accompanying drawing 14) of (calculated value) and carrying capacity Q.
Shown in accompanying drawing 12 (lithium battery of the different internal resistance value Ri of curve chart 1-with fill full carrying capacity Qc), the fitting function of generation:
(1) when 0.010m Ω＜Ri＜0.017m Ω:
Qc＝0.0008*10
4+0.0791*10
4*Ri-5.1538*10
4*Ri
2
(2) when 0.017m Ω＜Ri＜0.038m Ω:
Qc＝0.01*10
3-0.2562*10
3*Ri+2.7751*10
3*Ri
2
(3) when 0.038m Ω＜Ri＜0.070m Ω:
Qc＝5.7227-63.9104*Ri+513.8648*Ri
2
By accompanying drawing 13[curve chart 2-discharge capacity Qdc and real-time open circuit voltage U
0(calculated value)] with the real-time open circuit voltage U of lithium battery of the different internal resistance values of accompanying drawing 14[curve chart 3-
0(calculated value) and carrying capacity Q], draw following fitting function:
(1) as 3.900V＜U
0During＜4.200V:
Q＝139.8614*U
0-16.9724*U
0 2-280.3052
(2) as 3.700V＜U
0During＜3.900V:
Q＝38.5007*U
0-1.9177*U
0 2-113.8514
(3) as 3.400V＜U
0During＜3.700V:
Q＝19.2850*U
0 2-131.6067*U
0+225.1673
(4) as 2.800V＜U
0During＜3.400V:
Q＝1.5704*U
0 2-8.9174*U
0+12.6806
Provide least residue electric weight and real-time open circuit voltage computing schematic flow sheet (accompanying drawing 15-computing schematic flow sheet) in the present invention in the whole battery group at last.
Claims (1)
1. power lithium battery intelligent management system, it is used for, and charge and discharge process to the lithium battery group carries out that omnidistance real-time parameter detects, analyzes, study, control, show and externally communication and overall monitor that it mainly comprises:
(1) voltage check device; Be used for detecting the total voltage of lithium battery group and wherein respectively save monomer battery voltage and the lithium battery group respectively saves total open-circuit voltage values of cell open-circuit voltage values and lithium battery group;
(2) current sensing means; Be used for detecting the electric current of lithium battery group at charge and discharge process;
(3) temperature-detecting device; Be used to detect the real time temperature value that the lithium battery group in use respectively saves cell;
(4) control device; Be used to control charger, equalizer and lithium battery group discharge output, overcurrent protection;
(5) charging and discharging state judgment means; Be used to detect the real-time working state of lithium battery group;
(6) calculation element; Be used for to the lithium battery group open-circuit voltage values when dynamic, the internal resistance of cell, and the calculating of battery remaining power;
(7) data storage device; Be used to store voltage, electric current, internal resistance, battery remaining power and the fault message of lithium battery;
(8) parameter correction device; Be used to proofread and correct the variation that causes the internal resistance of cell because of the increase of charging and discharging lithium battery number of times, the variation of residual capacity;
(9) automatic learning device; Be used for learning situation of change at continuous use real-time voltage of lithium battery group and battery open circuit voltage, set up the real-time voltage of lithium battery, the open-circuit voltage values in the time of dynamically and the internal resistance of battery open circuit voltage and lithium battery, the relation between the battery remaining power;
(10) residual capacity judgment means; Be used for detecting in discharge process lithium battery residual capacity;
(11) data presentation device; Be used to show total voltage and each monomer battery voltage and the minimax voltage of current lithium battery group, the open circuit voltage of each cell and minimax open circuit voltage in the lithium battery group under the operating state, and corresponding battery sequence number; Charging and discharging currents, the residual capacity of lithium battery group, the operating state that temperature and lithium battery group are now located and the internal resistance of battery and fault message;
(12) communication device; Be used for carrying out information exchange, so that remote monitoring is used with computer and miscellaneous equipment;
(13) protective device; Be used for because the equipment that is connected with the lithium battery group is unlikely to have influence on a kind of protection system of the safety of lithium battery group when breaking down;
(14) system's automatic diagnostic device; Be used for this power lithium battery intelligent management system self is carried out the fault detect judgement and takes corresponding measure, to be unlikely to have influence on the safety of lithium battery group itself;
(15) alarm indication device; Be used for native system or be attached thereto the lithium battery group that connects and prompting when unusual appears in miscellaneous equipment.
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| CN2007100745090A CN101312293B (en) | 2007-05-22 | 2007-05-22 | Power lithium battery intelligent management system |
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| CN2007100745090A CN101312293B (en) | 2007-05-22 | 2007-05-22 | Power lithium battery intelligent management system |
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| CN101312293B true CN101312293B (en) | 2011-02-16 |
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